Rule 144 notice: insider sale of 40,985 shares

Christopher Peetz submitted a Rule 144 notice concerning ordinary shares of the issuer.

Rhea-AI Filing Summary

Christopher Peetz submitted a Rule 144 notice concerning ordinary shares of the issuer. The filing reports a sale of 40,985 shares on 03/16/2026 for $3,769,714.23 and an intended transaction involving 30,000 shares via a stock option exercise on 06/01/2026 to be settled for cash.

Insights

Securities Transactions Counsel

Routine Rule 144 notice for an insider sale and an upcoming option exercise.

The filing lists a completed disposition of $3,769,714.23 from 40,985 shares on 03/16/2026 and a planned stock option exercise of 30,000 shares on 06/01/2026 to be paid in cash. The document is a statutory notice rather than a registration.

Effect depends on holder decisions; cash‑flow treatment for the exercise is cash per the entry. Subsequent filings would show whether exercised shares are sold under Rule 144 or held.

Key Figures

Shares sold: 40,985 shares Proceeds from sale: $3,769,714.23 Planned exercise: 30,000 shares +1 more

4 metrics

Shares sold 40,985 shares Disposition on 03/16/2026

Proceeds from sale $3,769,714.23 Cash value reported for 40,985-share sale on 03/16/2026

Planned exercise 30,000 shares Stock option exercise scheduled for 06/01/2026

Form type Form 144 Rule 144 notice for restricted/controlled securities

Key Terms

Rule 144, Stock Option Exercise, Cash settlement

3 terms

Rule 144 regulatory

"Rule 144 notice concerning ordinary shares"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Stock Option Exercise financial

"Stock Option Exercise scheduled for 06/01/2026"

A stock option exercise is the act of using a previously granted right to buy shares of a company's stock at a specific, predetermined price by paying that price and receiving the shares. It matters to investors because exercising changes who owns the shares (which can dilute existing ownership), can trigger taxable events and shift potential gains or losses, and affects voting power and the company’s outstanding share count—like turning a voucher into an actual product that becomes part of circulating supply.

Cash settlement financial

"Cash listed as settlement method for the 30,000-share exercise"

Cash settlement is a process where, instead of exchanging physical assets like stocks or commodities, the parties involved settle the difference in value with money after a contract ends. For investors, it simplifies transactions by avoiding the need to handle or deliver the actual asset, making it quicker and more convenient to complete trades. This method ensures a straightforward way to settle agreements based on their final value.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does the MIRM Form 144 filed by Christopher Peetz disclose?

It discloses a sale of 40,985 shares on 03/16/2026 for $3,769,714.23 and a planned 30,000-share stock option exercise on 06/01/2026 to be settled in cash.

Did the filing indicate how the 30,000 shares will be paid for?

Yes. The 30,000-share stock option exercise scheduled for 06/01/2026 is listed with a cash settlement method, indicating payment will be made in cash at exercise.

When was the reported sale of shares executed according to the form?

The reported sale was executed on 03/16/2026, corresponding to the disposition of 40,985 shares recorded with a cash value of $3,769,714.23.

Does the Form 144 itself transfer title or complete the issuance?

No. The Form 144 is a notice under Rule 144; it does not itself transfer title or register securities. It reports a completed sale and a planned exercise; closing and any resale mechanics occur separately.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 06/01/2026 - 05:33 PM EDT Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001614740
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	MIRUM PHARMACEUTICALS, INC.
SEC File Number	001-38981
Address of Issuer	989 East Hillsdale Boulevard, Suite 300 Foster City CALIFORNIA 94404
Phone	(650) 667-4085
Name of Person for Whose Account the Securities are To Be Sold	CHRISTOPHER PEETZ
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer
Relationship to Issuer	Director

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	30000	2875107.00	60981227	06/01/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	06/01/2026	Stock Option Exercise	ISSUER			30000	06/01/2026	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
CHRISTOPHER PEETZ 989 East Hillsdale Boulevard, Suite 300 Foster City CA 94404	Common	03/16/2026	40985	3769714.23

144: Remarks and Signature

Remarks
Date of Notice	06/01/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	03/02/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Christopher James Peetz
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)